As the other reviewer says, "good addition," but I give 4 instead of 5 stars
because it is not convenient when one is popping pens into and out of the case
to remember that they only fit in one way. They are not the traditional round
edged pens.

Nice addition to a sketching kit for doodling and inking penciled drawings. I
really like the hard carrying case of this Uni Brush Pen Set (KFK-501), for its
three slender elegant brush pens are always protected, ready for use, and neatly
organized. The translucent pen caps can be posted on the opposite end of each
pen when in-use, and they close tightly once each pen is back in its case slot.
The round bumps near the end of each pen snap into the round holes at the top of
the pen case, so the brush pens are locked securely in place and will not fall
out even if you shake the case or hold it upside down. I noticed that the fine
brush pen tends to yield a bit of a dry-brush effect if you draw too fast with
it. The gray pen could be use for shading and adding another dimension to your
ink drawings. I find the the pens' minimalist design quite appealing already,
and I was quite pleased to discover that they still managed to include a subtle
"Japan" and "Mitsubishi" in raised molded lettering near the identifying nib
size ring on the end of each barrel.